Unconventional type of allylation reaction at the β-position of ketone carbonyl has been developed based on the β-metallo ketone strategy: treatment of siloxycyclopropanes 1 with allylic chlorides 2 in the presence of silver fluoride results in the effective formation of δ, ε-unsaturated ketones 4.
A .beta.-metal ketone strategy. Reactions of siloxycyclopropanes with silver(I) tetrafluoroborate and copper(II) tetrafluoroborate leading to 1,6-diketones